DIESELR Downpipe Back Exhaust - Single (2017-2019 GM 2500/3500 6.6L Duramax L5P)

The DIESELR Downpipe Back Exhaust L5P Duramax system is designed for serious diesel owners who demand performance, durability, and fitment precision. Built for 2017–2019 GM 2500/3500 HD trucks with the 6.6L L5P engine, this system replaces everything from the downpipe back—maximizing flow and eliminating restrictions without compromise.

Crafted from heavy-duty T409 stainless steel and mandrel-bent for smooth airflow, this system is built to withstand high temps, road salt, and heavy towing use. It’s the go-to choice for Duramax owners looking to improve throttle response, lower EGTs, and boost performance.

Key Features

• Mandrel-Bent T409 Stainless Steel: Resists corrosion, cracks, and high-heat stress
• OEM-Style 4-Bolt Turbo Flange: Fits stock turbo configuration without hassle
• No Bungs: Clean design, ideal for custom sensor setups or fully off-road builds
• Pre-Welded Hangers: Contour-bent and reinforced for easy factory-style mounting
• Leak-Free Sealing: High-quality flanges and TorcTite® clamps for secure connections
• Sound & Flow: Deeper exhaust note and improved exhaust evacuation

Fitment

• Compatible with:
    ‣ 2017–2019 GMC Sierra & Chevy Silverado 2500/3500 HD
    ‣ 6.6L Duramax L5P
    ‣ Fits EC-CC/SB-LB-Dually cab and bed configurations
• OEM-style 4-bolt flange at turbo required
• ❌ Will not fit V-band turbo setups or non-OEM configurations

Emissions Disclaimer

This downpipe back exhaust L5P Duramax system is intended for off-road use only and requires aftermarket tuning. Installation on emission-controlled vehicles may violate local, state, or federal regulations. Please confirm legality in your region before purchasing.